Size-determiner.



PATENTED AUG. I8, 1908. H.,GO0DWIN & w. R. ROWE.

SIZE DETERMINER. APPLICATION nun 0012s, 1907.

2 SHEETS-SHEET 1.

o I {Jr wane: .%%Z4W WMMQIM PATENTED AUG. is, 1908. H. eoonwm & W. R. ROWE.

SIZE DETERMINER.

APPLICATION FILED OCT. 8, 1907.

2 SHEETS-SHEET 2.

UNITED STATES PATENT OFFICE.

HARRY GOODWIN AND WILLIAM R. ROWE, OF NEW YORK, N. Y.

SIZE-DETERMINER.

Specification of Letters Patent.

Patented Aug. 18, 1908.

To all whom it may concern:

Be it known that we, HARRY GoonwrN, residing at New York city, borough of the Bronx, in the county of New York and State of New York, and WILLIAM R. ROWE, residing at New York city, borough of Brooklyn,

in the county of Kings and State of New York, citizens of the United States, have invented certain new and useful Improvements in Size-Determiners, of which the following is a specification, reference being had to the accompanying drawings, forming a part thereof.

Our invention relates to improvements in devices for determining the dimensions of figures as drawings, cuts, proof copies and the like, when drawn to a difierent scale; and, particularly, for determining the length of one side of such a figure upon a different (reduced or enlarged) scale, the length of the other side upon that scale being given, whereby both sides of the figure upon the new scale become known and the figure may be readily constructed upon such sides as aXes.

An object of our invention is to provide a device of this character which will prove perfectly accurate in use, susceptible of ready manipulation by unskilled persons and cheap in manufacture.

Another object of our invention is to provide a device of this character by means of which all mathematical computations will be rendered unnecessary and the determination made wholly by mechanical means.

A further object of our invention is to provide a device of this character which will not marthe surface of the paper upon which the original figure is laid out.

In the drawings illustrating the principle of our invention and the best mode now known to us of applying that principle, Figure 1 is a perspective view of our new size determiner Fig. 2 is a bottom plan view of one of the scale-bars, which is called by us the base-bar of the device; Fig. 3 is a section on the line 33 of Fig. 1; Fig. 4 shows the device in side view, when folded and not in use; Fig. 5 shows a modified form of our new size determiner hereinafter more fully described; Figs. 6, 7, 8 and 9 illustrate modified forms in which the reading-bar is pivotally mounted at the end of a swinging arm; and Fig. 10 is a-sectional detail on the line 1010 of Fig. 5.

The device consists essentially of the two scale-bars a, b and the reading-bar c. The scale-bar a is called by us the base-bar of the device and it is formed with a central longitudinal slot d. The other scale-bar b is called by us the rule and is formed at one end with a downwardly-turned flange e adapted to slide along the fiducial edge f of the base-bar a, whereby the two scale-bars a, b are maintained at right angles to each other. The lower face of the base-bar a is formed with a groove g which extends along the slot d (Fig. 2). Through the latter rojects the free end of a screw-stud h the ot er end of which is mounted in one end of the rule I). A thumbnut i lies in the groove g and engages the end of the stud h which projects thereinto; thus, the top of the thumb-nut i lies flush or level with the lower face of the base-bar and permits the base-bar to lie flat upon the surface of the paper upon which it rests.

The index-bar or reading-bar c is adjustably fastened to the base-bar a by means of a screw-stud h and a thumb-nut i, the latter lying in the groove 9 in a manner entirely similar to the thumb-nut i. The readingbar 0 is preferably made of thin, flexible material, so that it may be bent under the rule I) as shown in Fi 1.

The reading edges 7c of the scale-bars a, b

are provided with scales which may be graduated in any suitable manner. In Fig. 1 the unit used is the agate measure of printers. At the zero of the scale on the base-bar is placed the point of an index-pin or guidein m; and the zero of the scale on the rule fies in the same vertical plane as the reading edge k of the base-bar a.

To use the device, the base-bar a is placed upon the paper upon which is drawn the figure to be reproduced to a different scale; and the reading edge 70 of the base-bar is made coincident with the side of the figure the length of which in terms of the new scale is known. The point of the guide-pin m is placed at one end of this side. The rule I) is moved along the base-bar until its reading edge 7c coincides with the division on the base-bar which indicates the length of the side in terms of the new scale to which the figure is to be drawn. The reading edge 7c of the reading-bar c is then caused to pass through the lower right-hand corner of the drawing n and at the same time to contact with the point of the guide-pin m. That division of the scale upon the rule I) in which the reading edge is of the bar 0 cuts the reading edge is of the rule I), will indicate the length of the other side of the drawing to the new scale upon which it is to be reproduced. It is obvious that. the reading edge is of the bar may be first made to coincide with the diagonal of the drawing n; and then the rule I) may be brought to the division of the scale upon the base-bar a. at which is set off the index-bar c is then swung over the rule I).

In the modified form of our new device illustrated in Fig. 5, the rule 0 is not con nected with the'base-bar p but is pivotally fastened to the diagonal bar at r. The diagonal bar q is formed with a central longitudinal slot 3 to permit the rule to travel alon the base-bar p and the diagonal bar g. The atter is mounted free to swing about the pivot-pin t which projects through the slot at in the upper end of the base-bar and upon the up er end of which is mounted a nut 12. The ru e o is formed with a groove w (Fig. 10) in which is mounted free to slide the scaleplate :0. To use this modified form of our device, the point of the guide-pin m is brought, as before, coincident with the upper left-hand corner of the drawing at and the reading edge 7c of the base-bar p is made to lie along the left side of the drawing, it being assumed that the len th to which this side is to be reduced (or enIarged) is known. The reading edge 7c of the diagonal bar g is made to coincide with the diagonal of the drawing 71. and to pass in contact with the point of the guide-pin m. -.The rule ois then moved along the base-bar p and the diagonal bar 9, until it reaches that division of the scale on the base-bar p whichindicates the length of the known side of the drawing as it will be, when reproduced. The scale-plate 5c is provided with a depression y at one end in which the operator may engage his thumb or forefinger and push the scale-plate w, until its zero c0- incides with the reading edge 7c of the diagonal bar. The point where the reading edge of the base-bar p cuts the scale u on the scale-plate 90 indicates the len th of t e other side of the drawing as it will be, when redrawn to the new scale. In'manipulating the rule 0, it is obvious that care must be exercised to keep the reading edges ofthe rule andv the base-bar p at right angles to each other; and in doing this the lines indicating the divisions of the scale upon the base-bar will aid materially.

In Figs. 6 and 7 the diagonal bar 2 is shown pivotally mounted upon the free end of an arm 3 which is free to swing about a ivot 4 upon the upper end of the base-bar 5. n this case the latter is not slotted.

In Figs. 8 and 9 the reading-bar 76 is shown mounted pivotally u on the free end of an arm 3 in a manner entire y similar to that illustrated in Figs. 6 and 7 just referred to.

The scales shown upon the base-bar p and the rule 0 in Fig. 5 are inch scales; but any.

other suitable scales may be used.

We claim:'

1. The combination with a pair of graduated bars movable relatively to each other and a guide-pin mounted on one of said bars and free from connection with the other of said bars; of athird bar pivotally connected with one of said graduated bars; said guide pin being mounted below the point of pivotal connection of said third bar and the latter being adapted to lie against said guide-pin.

2. The combination with a pair of graduated bars movable relatively to each other and a guide-pin mounted on one of said bars and free from connection with the other of said bars, of a third bar pivotally connected with the last-named graduated bar; said guidein being mounted below the point of ivota connection of said third bar and the atter being adapted to lie against said guide 3. The combination with a pair of graduated bars movable relatively to each other and a guide-pin mounted on one of said bars and free from connection with the other of said bars at the beginning of the graduations thereon, of a third bar pivotally connected with the last-named graduated bar; said guidein being mounted below the point of pivotal connection of said third bar and the atter being adapted to lie against said guidein. p In witness whereof we have hereunto set our hands at said New York city in the pres ence of the two undersigned witnesses this seventh day of October, 1907.

HARRY GOODWIN. WILLIAM R. ROWE.

Witnesses MARGARET HAMILTON, CHESTER H. LANE. 

